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No your iodine level. Bring iodine level to .05 to .06 ppm. Zoas need iodine trace. My dkh is 8. Sg 1.026. Calcium 430. P04 .037 to .1. I have t0 dise 2 drops a week. Us my small daily water changes.Have you found your issue with your zoas yet? I have some that have all closed for a round a week now, they have been In the tank for 3 years, I've added nothing new stock wise for over a year and a half. The only thing I notice is my hermit crabs using them as a climbing wall as the zoas that are struggling are on my rear filter box. I don't know if this is the issue or not. Iodine seems like it could be low, as I don't do very frequent water changes to replace it. Let us know if you find the solution.